Three Engineering Notices April 1997
Reference drawing #18 You can change tubing size to reduce weight as an option.
Reference drawing #25 - You will need to hone out the inside of the cylinder after welding so that there is no area for the piston to bind.
Smooth all sharp edges so as not to cut the "O" rings.
Reference drawing #28 - Locate the flap control mount 4 1/2" forward of station "C".